trans woman here! in addition to agreeing with the questions toy is asking above, I'd also point out that there is no one general trans experience. She is trans, yes, and that is an integral aspect of her character, but she is also just herself. let her be herself and, when her trans identity becomes necessary to decipher within the context of your work, let her show you how she interprets her transness– after all, she will know her experience better than anyone else. once she's fleshed out as a character, she will let you know what you need to know.
also, as I would recommend for anyone writing about any character who doesn't fit the author's own experiences in any way, please get sensitivity readers on your work! it is okay to not have things "correct" in draft versions; that's what sensitivity edits are for. Give life to your character and she will show you how she wants to be written, and once you've written her, go from there and make sure you've done her story justice.